Question: What is the relationship between the energy of a photon and its frequency?

Options:

1. Energy is directly proportional to frequency
2. Energy is inversely proportional to frequency
3. Energy is independent of frequency
4. Energy is proportional to the square of frequency

Correct Answer: Energy is directly proportional to frequency

Solution:

The energy of a photon is directly proportional to its frequency, as given by the equation E = hf, where h is Planck\'s constant.